The Faraday effect is a phenomenon in which the polarization of light is rotated when it passes through a material in the presence of a magnetic field. Discovered by Michael Faraday in 1845, this effect occurs in certain materials, such as glass or crystals, that exhibit magneto-optic properties. The degree of rotation depends on the strength of the magnetic field and the properties of the material. This effect has practical applications in various fields, including telecommunications and optical devices. For instance, it is used in optical isolators to prevent unwanted feedback in laser systems, ensuring stable operation and improved performance in fiber optic communications.